103 lines
3.8 KiB
C
103 lines
3.8 KiB
C
/*
|
|
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
|
|
2011,2012 Giovanni Di Sirio.
|
|
|
|
This file is part of ChibiOS/RT.
|
|
|
|
ChibiOS/RT is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
ChibiOS/RT is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/**
|
|
* @file MSP430/chcore.c
|
|
* @brief MSP430 architecture port code.
|
|
*
|
|
* @addtogroup MSP430_CORE
|
|
* @{
|
|
*/
|
|
|
|
#include "ch.h"
|
|
|
|
/**
|
|
* @brief Performs a context switch between two threads.
|
|
* @details This is the most critical code in any port, this function
|
|
* is responsible for the context switch between 2 threads.
|
|
* @note The implementation of this code affects <b>directly</b> the context
|
|
* switch performance so optimize here as much as you can.
|
|
* @note The function is declared as a weak symbol, it is possible to
|
|
* redefine it in your application code.
|
|
*
|
|
* @param[in] ntp the thread to be switched in
|
|
* @param[in] otp the thread to be switched out
|
|
*/
|
|
#if !defined(__DOXYGEN__)
|
|
__attribute__((naked, weak))
|
|
#endif
|
|
void port_switch(Thread *ntp, Thread *otp) {
|
|
register struct intctx *sp asm("r1");
|
|
|
|
asm volatile ("push r11 \n\t" \
|
|
"push r10 \n\t" \
|
|
"push r9 \n\t" \
|
|
"push r8 \n\t" \
|
|
"push r7 \n\t" \
|
|
"push r6 \n\t" \
|
|
"push r5 \n\t" \
|
|
"push r4" : : : "memory");
|
|
otp->p_ctx.sp = sp;
|
|
sp = ntp->p_ctx.sp;
|
|
asm volatile ("pop r4 \n\t" \
|
|
"pop r5 \n\t" \
|
|
"pop r6 \n\t" \
|
|
"pop r7 \n\t" \
|
|
"pop r8 \n\t" \
|
|
"pop r9 \n\t" \
|
|
"pop r10 \n\t" \
|
|
"pop r11 \n\t" \
|
|
"ret" : : "r" (sp) : "memory");
|
|
}
|
|
|
|
/**
|
|
* @brief Halts the system.
|
|
* @details This function is invoked by the operating system when an
|
|
* unrecoverable error is detected (for example because a programming
|
|
* error in the application code that triggers an assertion while in
|
|
* debug mode).
|
|
* @note The function is declared as a weak symbol, it is possible to
|
|
* redefine it in your application code.
|
|
*/
|
|
#if !defined(__DOXYGEN__)
|
|
__attribute__((weak))
|
|
#endif
|
|
void port_halt(void) {
|
|
|
|
port_disable();
|
|
while (TRUE) {
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Start a thread by invoking its work function.
|
|
* @details If the work function returns @p chThdExit() is automatically
|
|
* invoked.
|
|
*/
|
|
void _port_thread_start(void) {
|
|
|
|
chSysUnlock();
|
|
asm volatile ("mov r11, r15 \n\t" \
|
|
"call r10 \n\t" \
|
|
"call #chThdExit");
|
|
}
|
|
|
|
/** @} */
|